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Employee Benefit Plans (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension Contributions |  |  | $ 2,008,000,000 | $ 125,000,000
Contributions - Defined benefit plans | $ 1,929,000,000 | $ 18,000,000 | 2,008,000,000 | 125,000,000
Contributions - Defined contribution plans | 86,000,000 | 79,000,000 | 262,000,000 | 235,000,000
Domestic Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension Contributions | 1,900,000,000 | 0 | 1,900,000,000 | 0
Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 94,000,000 | 96,000,000 | 280,000,000 | 287,000,000
Interest cost | 281,000,000 | 302,000,000 | 838,000,000 | 908,000,000
Expected return on plan assets | 555,000,000 | 554,000,000 | 1,636,000,000 | 1,669,000,000
Amortization of prior service credit | (9,000,000) | (7,000,000) | (27,000,000) | (22,000,000)
Recognized actuarial net loss (gain) | (144,000,000) | (135,000,000) | (430,000,000) | (406,000,000)
Net settlement and curtailment (gain) loss | (2,000,000) | (3,000,000) | (1,000,000) | (18,000,000)
Total net periodic benefit (income) cost | (43,000,000) | (25,000,000) | (114,000,000) | (72,000,000)
Defined Benefit Plan, Accumulated Benefit Obligation, Increase (Decrease) for Plan Amendment |  |  | (170,000,000) |
Other Postretirement Benefits Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 0 | 1,000,000 | 2,000,000 | 3,000,000
Interest cost | 9,000,000 | 9,000,000 | 22,000,000 | 25,000,000
Expected return on plan assets | 0 | 0 | 0 | 0
Amortization of prior service credit | (1,000,000) | 0 | (1,000,000) | 0
Recognized actuarial net loss (gain) | 2,000,000 | 1,000,000 | 7,000,000 | 3,000,000
Net settlement and curtailment (gain) loss | 0 | 0 | 0 | 0
Total net periodic benefit (income) cost | $ 6,000,000 | $ 9,000,000 | $ 16,000,000 | $ 25,000,000

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- Definition Amount of increase (decrease) in accumulated benefit obligation from change in existing term of defined benefit plan or initiation of new defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (r) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(ii) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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